刘扬，刘晨，陈世凡，申华.基于声学有限元的柴油机增压器压气机气动噪声研究[J].内燃机工程,2020,41(3):81-86.
基于声学有限元的柴油机增压器压气机气动噪声研究
Study of Aerodynamic Noise of a Diesel Turbocharger Compressor Based on Acoustic Finite Element Method
DOI：10.13949/j.cnki.nrjgc.2020.03.011
关键词:增压器  压气机  气动噪声  声学有限元  船用柴油机
Key Words:turbocharger  compressor  aerodynamic noise  acoustic finite element method  marine diesel engine
基金项目:工信部高技术船舶科研项目——低速机工程（一期）
作者单位
刘扬，刘晨，陈世凡，申华 1.重庆江增船舶重工有限公司，重庆 402263；2.哈尔滨工程大学 动力与能源工程学院，哈尔滨 150001 
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摘要:为研究船用低速柴油机增压器压气机气动噪声，采用计算流体动力学和声学有限元的混合计算方法进行了数值预测。通过试验对压气机计算模型进行了验证。在3个工况下对压气机非定常流场进行了计算，其中压力脉动被用作声学计算中的声源信息；采用声学有限元方法对压气机气动噪声进行了预测。结果表明：计算流体力学和声学有限元的混合计算方法具有较高的计算精度，可以用于压气机气动噪声数值预测；压气机进口气动噪声主要谱成分为离散单音噪声和宽频噪声；离散单音噪声在叶片通过频率处有明显的指向性，存在两个突出峰值。
Abstract:In order to study the aerodynamic noise of a marine low-speed diesel turbocharger compressor, a hybrid calculation method of the computational fluid dynamics(CFD) and acoustic finite element method(FEM) was used to predict it, and verified by bench test. The unsteady flow field in the compressor was calculated under three different operating conditions, where the pressure fluctuation was used as a noise source in the acoustic simulation. Results indicate that the hybrid calculation method has a higher calculation accuracy and can be used for numerical prediction of the compressor's aerodynamic noise. Moreover, the main components of aerodynamic noise at the compressor inlet include discrete tonal noise and broadband noise. As observed, the discrete tonal noise exhibits an obvious acoustic directivity at blade passing frequency(BPF) and has two prominent peaks.
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